红外成像系统利用光学系统和红外探测器接收目标物体的红外辐射, 并将红外辐射分布图以人眼可观测的方式显示出来。成像处理电路功能包括为探测器提供电源、偏置电压和驱动信号使探测器能够正常工作。偏置电压源的噪声将给探测器的输出引入噪声, 增大系统的 NETD, 降低系统性能。在设计低噪声偏置电压源的基础上, 采用经典噪声测量电路对偏置电压源的噪声进行了测量。为测量偏压源的低频噪声, 噪声测量电路分为前置放大电路和 0.1～10 Hz滤波电路。对红外探测器用偏置电压源各级电压进行噪声测量后, 得出了噪声值最小的红外探测器用偏置电压源的设计方案。

The infrared imaging system utilizes an optical system and an infrared detector to receive the infrared radiation of the target object and handle the infrared radiation distribution in a way that is visible to the human eye. The functions of the imaging processing circuit include providing power supply, bias voltage, and the drive signal for the detector. The noise of the bias voltage source introduces noise to the output of the detector, increases the noise equivalent temperature difference (NETD) of the system and lowers the system performance. In this study we employ a classic noise measurement circuit to measure the noise of bias voltage on the basic design of the low noise bias voltage source. In order to measure the low frequency noise, the measurement circuit can be divided into the pre-amplifier and the 0.1-10 Hz filter. We developed a program for the low noise bias voltage source for the noise measurement of bias voltage.